STOP Early Journal Content on JSTOR, Free to Anyone in the World This article is one of nearly 500,000 scholarly works digitized and made freely available to everyone in the world by JSTOR. Known as the Early Journal Content, this set of works include research articles, news, letters, and other writings published in more than 200 of the oldest leading academic journals. The works date from the mid-seventeenth to the early twentieth centuries. We encourage people to read and share the Early Journal Content openly and to tell others that this resource exists. People may post this content online or redistribute in any way for non-commercial purposes. Read more about Early Journal Content at http://about.jstor.org/participate-jstor/individuals/early- journal-content . JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not-for-profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact firstname.lastname@example.org. Volume V Number 3 Annals of the Missouri Botanical Garden Contents September, 1918 The Thelephoraceae of North America. IX E. A. Burt 177-203 A New Selaginella from Mexico J. M. Greenman and Norma E. Pfeiffer 205-210 Algological Notes. III. A Wood-penetrating Alga, Gomontia lignicola, n. sp. G. T. Moore 211-224 PUBLISHED QUARTERLY BY THE BOARD OF TRUSTEES OF THE MISSOURI BOTANICAL GARDEN, ST. LOUIS, MISSOURI Entered as second-class matter at the Post Office at St. Jxnjis, Missouri, under tlie Act of March 3, IS79 Annals ot the xMissouri Botanical Garden A Quarterly Journal containing Scientific Contributions from the Missouri Botanical Garden and the Graduate Labora- tory of the Henry Shaw School of Botany of Washington University in affiliation with the Missouri Botanical Garden. Editorial Committee George T. Moore Benjamin M. Duggar Information The Annals of the Missouri Botanieal Garden appears four times dur- ing the calendar year, February, April, September, and November. Four numbers constitute a volume. Subscription Price - - $3.00 per volume Single Numbers - - - 1.00 each The following agent is authorized to accept foreign subscription;): William Wesley ft Son, 28 Esses Street, Strand, London.